java模拟浏览器上传文件

 public static void main(String[] args) {
         String str = uploadFile("C:/Users/RGKY/Desktop/wKgBHVbLtuWAVNZAAABB_J2qzhc553.jpg", "http://localhost:8087/worldapp/fastfds/uploadSingleFile.cf?fieldName=selectFile", "wKgBHVbLtuWAVNZAAABB_J2qzhc553.jpg");
         System.out.println(str);
     }

     /**
      *
      * @param file
      *            待上传的文件路径
      * @param uploadUrl
      *            上传服务接口路径
      * @param fileName
      *            文件名称，服务器获取的文件名称
      * @return
      */
     public static String uploadFile(/* Bitmap src */String file, String uploadUrl, String fileName) {
         String end = "\r\n";
         String twoHyphens = "--";
         String boundary = "******";
         try {
             URL url = new URL(uploadUrl);
             HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
             // 设置每次传输的流大小，可以有效防止手机因为内存不足崩溃
             // 此方法用于在预先不知道内容长度时启用没有进行内部缓冲的 HTTP 请求正文的流。
             httpURLConnection.setChunkedStreamingMode(128 * 1024);// 128K
             // 允许输入输出流
             httpURLConnection.setDoInput(true);
             httpURLConnection.setDoOutput(true);
             httpURLConnection.setUseCaches(false);
             // 使用POST方法
             httpURLConnection.setRequestMethod("POST");
             httpURLConnection.setRequestProperty("Connection", "Keep-Alive");
             httpURLConnection.setRequestProperty("Charset", "UTF-8");
             httpURLConnection.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);

             DataOutputStream dos = new DataOutputStream(httpURLConnection.getOutputStream());
             dos.writeBytes(twoHyphens + boundary + end);
             // name相当于html标签file的name属性，fileName相当于标签value值
             dos.writeBytes("Content-Disposition: form-data;name=\"selectFile\";fileName=\"" + fileName + "\"" + end);
             dos.writeBytes(end);

             // 将要上传的内容写入流中
             // InputStream srcis = Function.Bitmap2IS(src);
             InputStream srcis = new FileInputStream(file);
             byte[] buffer = new byte[8192]; // 8k
             int count = 0;
             // 读取文件
             while ((count = srcis.read(buffer)) != -1) {
                 dos.write(buffer, 0, count);
             }
             srcis.close();

             dos.writeBytes(end);
             dos.writeBytes(twoHyphens + boundary + twoHyphens + end);
             dos.flush();

             InputStream is = httpURLConnection.getInputStream();
             InputStreamReader isr = new InputStreamReader(is, "utf-8");
             BufferedReader br = new BufferedReader(isr);
             // 上传返回值
             String sl;
             String result = "";
             while ((sl = br.readLine()) != null)
                 result = result + sl;
             br.close();
             is.close();
             return result;
         } catch (Exception e) {
             e.printStackTrace();
             return "网络出错!";
         }
     }